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1. What do you expect the primary danger in this lab will be?
2. What do we need to convert from mass to moles?
3. How can we determine if the crucible is cool? Dakota State University Page 89 of 232 Experiment 5: Empirical Formula General Chemistry I and II Lab Manual Post-Lab Questions:
1. If moisture was still on the crucible before adding the hydrated salt, which was then
subsequently driven off in the drying step for the salt, would your calculated molar ratio of salt to
water be too high or too low?
2. If you did not drive all of the moisture out of the hydrate, would your calculated molar ratio
of salt to water be too high or too low? Dakota State University Page 90 of 232 Experiment 6: Probability General Chemistry I and II Lab Manual Experiment 6: Probability
Purpose: To generate a fair quantity of numbers for students to practice certain statistical tests
and methods.
Porpoise: A friendly aquatic animal. Background:
None
Introduction: There is an old joke, regarding a famous concert hall, Carnegie Hall, in which
only the most talented musicians in the world are invited to play. It goes like this; “How do I get
to Carnegie Hall?” “Practice, practice, practice.”
And then there would be huge laughter.
That’s the idea behind today’s experiment. Sure, you can practice on the homework problems,
but then I would be forced to think up a real experiment. So, we’re doing this instead. You will
be generating your own data for statistical analysis. The concept is to have one data set that
should be completely random, one data set that should not be random but should, none the less,
contain a good amount of human error, and one data set that should provide a linear relationship,
but with fairly good random error as well. I would like you to perform the statistical analysis
using Excel, both by putting in your own formulae (from our textbook), and from using Excel’s
built in functions. I also highly encourage you to repeat these calculations using your hand- held
calculator as practice for the exam, since you probably won’t have Excel available to you then.
Good luck!
Procedure:
CAUTION! Wear safety goggles and aprons throughout the entire experiment! Unless you don’t
want to.
A dicey problem: You will find dice in the lab. Throw this dice 100 times, keeping track of the
sum total of each throw.
Return to Middle School: If a paper football does not exist, make one. On the floor, use a
piece of tape to denote the “touchdown”. From the other side of the lab, slide the paper football
100 times; record the distance from “scoring” for each throw. Remember to keep track of the
Dakota State University Page 91 of 232 Experiment 6: Probability General Chemistry I and II Lab Manual signs of the distances as well (“+” if each throw was too far, “-” if each throw was not far
enough).
Buns of Mossy Zinc: Using a balance, obtain the mass of one piece of mossy zinc. Remove the
zinc, tare the balance, and obtain the mass of two pieces of mossy zinc. Continue in this fashion,
increasing t...
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